Clarence House surprise-released images of a group photo shoot done in honor of Princess Charles' 70th birthday, featuring Prince Charles and the Duchess of Cornwall; the Duke and Duchess of Sussex; and the Duke and Duchess of Cambridge with their three children: Prince George, Princess Charlotte, and Prince Louis. Royal fans instantly began gushing over the candid nature of the portraits—and it didn't take long for them to find a connection to Princess Diana, via Middleton's outfit.

In the photos, the Duchess of Cambridge wears a navy polka-dot dress with a contrasting ivory collar by Alessandra Rich. And for some, it brought to mind a style worn by Princess Diana back in 1985, while at home in Kensington Palace.

Side by side, the similarities are striking. The designer of Middleton's dress is known for her vintage-inspired silhouettes and prints, so we can partially credit the '80s look of the style to that. Still, the duchess has a well-documented streak of Diana-esque outfits, dating back to 2005, when she first started being photographed with Prince William.

This exact Alessandra Rich dress also happens to be a celebrity favorite, having been worn by Sarah Jessica Parker, Daisy Ridley, and Abigail Spencer—the latter to Meghan Markle and Prince Harry's wedding, no less. The royal connection is strong.